NDLI: Permittivity measurement of disk and annular dielectric samples using coaxial transmission line fixtures. part I: theory and formulation

Content Provider	IEEE Xplore Digital Library
Author	Kehn, M.N.M. Shafai, L. Noghanian, S.
Copyright Year	2003
Abstract	One way of measuring the permittivity of circularly shaped dielectric samples is to measure the S-parameters of a two-port coaxial transmission line fixture into which the samples are placed. Among the sample forms that can be fitted into coaxial waveguides are (1) circular disks and (2) annular rings. The former type is sandwiched between two disjointed inner conductors of the coaxial line, whereas the latter dielectric form is snug-fitted to become the insulation layer of an intermediate coaxial section. Each type of sample requires a different coaxial configuration; this work studies both fixtures. The investigation of the first type is based on a previously studied technique that treats the sandwiched circular disk as a parallel-plate capacitor. Because of inaccuracies in the original form of that method, a modified version that offers improved accuracy is devised here. In addition, a new, independently developed technique for accurately characterizing dielectrics of the second form (annular-ring samples) using quadratic curve fitting is proposed. The experimental fixture, comprising a connected series of coaxial waveguide sections, is numerically treated with the method of moments and mode-matching technique. Details of the theoretical groundwork are presented in this paper, which constitutes the first of two parts of this work. Part II, also appearing in this issue, describes the measurement technique in detail and presents simulation results of the experimental procedure based on the formulation presented herein. In addition, the method that treats circular disks is also investigated in Part II and is used to make comparative performance studies.
Starting Page	21
Ending Page	29
Page Count	9
File Size	1196555
File Format	PDF
ISSN	08408688
Volume Number	34
Issue Number	1 and 2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE) Canada
Publisher Date	2009-01-01
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Permittivity measurement Coaxial components Transmission line theory Fixtures Dielectric measurements Transmission line measurements Shape measurement Scattering parameters Conductors Dielectrics and electrical insulation coaxial waveguides; mode matching; moment method; permittivity measurement
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Hardware and Architecture

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